Of the plans put forward by the federal government to identify and stop budding terrorists, among the least understood are the FBI’s “Shared Responsibility Committees.”

The idea of the committees is to enlist counselors, social workers, religious figures, and other community members to intervene with people the FBI thinks are in danger of radicalizing — the sort of alternative to prosecution and jail time many experts have been clamoring for. But civil liberties groups worry the committees could become just a ruse to expand the FBI’s network of informants, and the government has refused to provide details about the program.

The Intercept has obtained a letter addressed to potential committee members from the FBI, outlining how the process would work.